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id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2020-09-05T09:27:13.000Z" title="发表于 2020-09-05 17:27:13">2020-09-05</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-01-10T12:10:42.186Z" title="更新于 2021-01-10 20:10:42">2021-01-10</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E5%89%8D%E7%AB%AF%E5%AD%A6%E4%B9%A0/">前端学习</a></span></div><div class="meta-secondline"> <span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">1.4k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>4分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><ol>
<li><h1 id="初识-JavaScript"><a href="#初识-JavaScript" class="headerlink" title="初识 JavaScript"></a>初识 JavaScript</h1><blockquote>
<p>纯属随笔记录，具体详细教程，请查阅<a target="_blank" rel="noopener" href="https://developer.mozilla.org/zh-CN/">MDN Web 文档</a></p>
</blockquote>
<h2 id="1-1-JavaScript-是什么："><a href="#1-1-JavaScript-是什么：" class="headerlink" title="1.1 JavaScript 是什么："></a>1.1 JavaScript 是什么：</h2><ul>
<li><p><strong>布兰登·艾奇</strong>（Brendan Eich，1961年～）。</p>
</li>
<li><p>神奇的大哥用10天完成 JavaScript 设计。</p>
</li>
<li><p>最初命名为 LiveScript，后来在与 **Sun **合作之后将其改名为 JavaScript。</p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200905/gLHsWF66AmhR.png" alt="布兰登·艾奇"></p>
</li>
<li><p>JavaScript 是世界上最流行的语言之一，是一种<strong>运行在客户端的脚本语言 （Script 是脚本的意思）</strong></p>
</li>
<li><p><strong>脚本语言：</strong>不需要编译，运行过程中由 js 解释器( js 引擎）逐行来进行解释并执行</p>
</li>
<li><p>现在也可以基于 Node.js 技术进行服务器端编程</p>
</li>
<li><p>为了阅读方便，我们后面把JavaScript 简称为 JS。</p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200905/^25I1cNyrvBr.png" alt="客户端脚本语言"></p>
</li>
</ul>
<h2 id="1-2-JavaScript-的作用："><a href="#1-2-JavaScript-的作用：" class="headerlink" title="1.2 JavaScript 的作用："></a>1.2 JavaScript 的作用：</h2><ul>
<li>表单动态校验（密码强度检测）  <strong>（ JS 产生最初的目的 ）</strong></li>
<li>网页特效</li>
<li>服务端开发(Node.js)</li>
<li>桌面程序(Electron)</li>
<li>App(Cordova)</li>
<li>控制硬件-物联网(Ruff)</li>
<li>游戏开发(cocos2d-js)</li>
</ul>
<h2 id="1-3-HTML-CSS-JS-的关系："><a href="#1-3-HTML-CSS-JS-的关系：" class="headerlink" title="1.3 HTML/CSS/JS 的关系："></a>1.3 HTML/CSS/JS 的关系：</h2><h4 id="HTML-CSS-标记语言–描述类语言："><a href="#HTML-CSS-标记语言–描述类语言：" class="headerlink" title="HTML/CSS 标记语言–描述类语言："></a>HTML/CSS 标记语言–描述类语言：</h4><ol>
<li>HTML 决定网页结构和内容( 决定看到什么 )，相当于人的身体</li>
<li>CSS 决定网页呈现给用户的模样( 决定好不好看 )，相当于给人穿衣服、化妆</li>
</ol>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200905/rnxfzmGuSUDl.png" alt="HTML和CSSl.png"></p>
<h4 id="JS-脚本语言–编程类语言："><a href="#JS-脚本语言–编程类语言：" class="headerlink" title="JS 脚本语言–编程类语言："></a>JS 脚本语言–编程类语言：</h4><ol>
<li>实现业务逻辑和页面控制( 决定功能 )，相当于人的各种动作 </li>
</ol>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200905/YMIlC9afLTar.png" alt="JS"></p>
<h2 id="1-4-浏览器执行-JS-简介："><a href="#1-4-浏览器执行-JS-简介：" class="headerlink" title="1.4 浏览器执行 JS 简介："></a>1.4 浏览器执行 JS 简介：</h2><p>​    <strong>浏览器分成两部分：渲染引擎和 JS 引擎</strong></p>
<ul>
<li><p><strong>渲染引擎：</strong>用来解析HTML与CSS，俗称内核，比如 <strong>chrome 浏览器的 blink ，老版本的 webkit</strong></p>
</li>
<li><p><strong>JS 引擎：</strong>也称为<strong>JS 解释器</strong>。 用来读取网页中的JavaScript代码，对其处理后运行，比如 <strong>chrome  浏览器的 V8</strong></p>
</li>
<li><p><strong>注:</strong>  浏览器本身并不会执行JS代码，而是通过内置 JavaScript 引擎(解释器) 来执行 JS 代码 。JS 引擎执行代码时逐行解释每一句源码（转换为机器语言），然后由计算机去执行，所以 JavaScript 语言归为脚本语言，会逐行解释执行。</p>
</li>
</ul>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200905/GOZi!HM!Cg2M.png" alt="浏览器执行JS"></p>
<h2 id="1-5-JS-的组成："><a href="#1-5-JS-的组成：" class="headerlink" title="1.5 JS 的组成："></a>1.5 JS 的组成：</h2><p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200905/JhB1HhJiFu4V.png" alt="JS的组成"></p>
<ul>
<li><h4 id="ECMAScript："><a href="#ECMAScript：" class="headerlink" title="ECMAScript："></a>ECMAScript：</h4><ul>
<li><strong>ECMAScript</strong> 是由ECMA 国际（ 原欧洲计算机制造商协会）进行标准化的一门编程语言，这种语言在<strong>万维网</strong>上应用广泛，它往往被称为** JavaScript 或 JScript<strong>，但实际上后两者是</strong> ECMAScript 语言的实现和扩展**。</li>
</ul>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200905/q85Tm*iT4zW2.png" alt="ECMAScript"></p>
<ul>
<li><strong>ECMAScript：</strong>ECMAScript 规定了<strong>JS的编程语法和基础核心知识</strong>，是所有浏览器厂商共同遵守的一套JS语法工业标准。</li>
</ul>
</li>
<li><h4 id="DOM-——文档对象模型："><a href="#DOM-——文档对象模型：" class="headerlink" title="DOM ——文档对象模型："></a>DOM ——文档对象模型：</h4><ul>
<li><strong>文档对象模型（Document Object Model，简称DOM）</strong>，是<strong>W3C组织</strong>推荐的处理<strong>可扩展标记语言的标准编程接口</strong>。通过 DOM 提供的接口可以对页面上的各种元素进行操作（大小、位置、颜色等）。</li>
</ul>
</li>
<li><h4 id="BOM-——浏览器对象模型："><a href="#BOM-——浏览器对象模型：" class="headerlink" title="BOM ——浏览器对象模型："></a>BOM ——浏览器对象模型：</h4><ul>
<li><strong>BOM (Browser Object Model，简称BOM) 是指浏览器对象模型</strong>，它提供了独立于内容的、可以与浏览器窗口进行互动的对象结构。通过BOM可以操作浏览器窗口，比如弹出框、控制浏览器跳转、获取分辨率等。</li>
</ul>
</li>
</ul>
<h2 id="1-6-JS-初体验："><a href="#1-6-JS-初体验：" class="headerlink" title="1.6 JS 初体验："></a>1.6 JS 初体验：</h2><blockquote>
<p>JS 有3种书写位置，分别为<strong>行内</strong>、<strong>内嵌</strong>和<strong>外部</strong>。</p>
</blockquote>
<ol>
<li><h4 id="行内式-JS："><a href="#行内式-JS：" class="headerlink" title="行内式 JS："></a>行内式 JS：</h4><figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">&lt;input type=<span class="string">&quot;button&quot;</span> value=<span class="string">&quot;点我试试&quot;</span> onclick=<span class="string">&quot;alert(&#x27;Hello World&#x27;)&quot;</span> /&gt;</span><br></pre></td></tr></table></figure>

<p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200905/6*Q7u6me7vfp.png" alt="行内式JS效果"></p>
<p><strong>注:</strong></p>
<ul>
<li>可以将<strong>单行或少量 JS 代码</strong>写在HTML标签的事件属性中（以 on 开头的属性），如：onclick</li>
<li>注意单双引号的使用：在<strong>HTML</strong>中我们推荐使用<strong>双引号</strong>, <strong>JS **中我们推荐使用</strong>单引号**</li>
<li>可读性差， 在<strong>html中编写JS大量代码</strong>时，不方便阅读；</li>
<li>引号易错，引号多层嵌套匹配时，非常容易弄混；</li>
<li>特殊情况下使用</li>
</ul>
</li>
<li><h4 id="内嵌-JS"><a href="#内嵌-JS" class="headerlink" title="内嵌 JS:"></a>内嵌 JS:</h4><figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">&lt;script&gt;</span><br><span class="line">    alert(<span class="string">&#x27;Hello  World~!&#x27;</span>);</span><br><span class="line">&lt;/script&gt;</span><br></pre></td></tr></table></figure>

<p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200905/xIWcvfdW@ahW.png" alt="直接弹出"></p>
<ul>
<li>可以将多行JS代码写到 <code>&lt;script&gt;</code> 标签中</li>
<li>内嵌 JS 是学习时常用的方式</li>
</ul>
</li>
<li><h4 id="外部-JS文件"><a href="#外部-JS文件" class="headerlink" title="外部 JS文件:"></a>外部 JS文件:</h4><figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">&lt;script src=<span class="string">&quot;my.js&quot;</span>&gt;&lt;/script&gt;</span><br></pre></td></tr></table></figure>

<p><strong>效果:</strong></p>
<p>​    <strong>同上</strong></p>
<ul>
<li>利于HTML页面代码<strong>结构化</strong>，把大段 JS代码独立到 HTML 页面之外，既美观，也方便文件级别的复用</li>
<li>引用外部 JS文件的<code>script</code> 标签中间不可以写代码</li>
<li>适合于<strong>JS 代码量比较大</strong>的情况</li>
</ul>
</li>
</ol>
</li>
</ol>
<hr>
<ol start="2">
<li><h1 id="JavaScript注释"><a href="#JavaScript注释" class="headerlink" title="JavaScript注释:"></a>JavaScript注释:</h1><h2 id="2-1-单行注释"><a href="#2-1-单行注释" class="headerlink" title="2.1 单行注释:"></a>2.1 单行注释:</h2><blockquote>
<p>为了提高代码的可读性，JS与CSS一样，也提供了注释功能。JS中的注释主要有两种，分别是单行注释和多行注释。</p>
</blockquote>
<h4 id="单行注释的注释方式如下："><a href="#单行注释的注释方式如下：" class="headerlink" title="单行注释的注释方式如下："></a>单行注释的注释方式如下：</h4><figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"><span class="comment">// 我是一行文字，不想被 JS引擎 执行，所以 注释起来</span></span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>解释:</strong> </p>
<p> //  用来注释单行文字（  快捷键   ctrl  +  /   ）</p>
</li>
</ul>
<h2 id="2-2-多行注释"><a href="#2-2-多行注释" class="headerlink" title="2.2 多行注释:"></a>2.2 多行注释:</h2><h4 id="多行注释的注释方式如下："><a href="#多行注释的注释方式如下：" class="headerlink" title="多行注释的注释方式如下：:"></a>多行注释的注释方式如下：:</h4><figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment">  获取用户年龄和姓名</span></span><br><span class="line"><span class="comment">  并通过提示框显示出来</span></span><br><span class="line"><span class="comment">*/</span></span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>解释:</strong></p>
<p>/* */  用来注释多行文字（ 默认快捷键  alt +  shift  + a ）</p>
<p>快捷键修改为：   ctrl + shift  +  /<br>vscode &gt; 首选项按钮  &gt;  键盘快捷方式 &gt;  查找原来的快捷键  &gt; 修改为新的快捷键 &gt; 回车确认</p>
</li>
</ul>
</li>
</ol>
<hr>
<ol start="3">
<li><h1 id="JavaScript-输入输出语句"><a href="#JavaScript-输入输出语句" class="headerlink" title="JavaScript 输入输出语句:"></a>JavaScript 输入输出语句:</h1><h4 id="为了方便信息的输入输出，JS中提供了一些输入输出语句，其常用的语句如下："><a href="#为了方便信息的输入输出，JS中提供了一些输入输出语句，其常用的语句如下：" class="headerlink" title="为了方便信息的输入输出，JS中提供了一些输入输出语句，其常用的语句如下："></a>为了方便信息的输入输出，JS中提供了一些输入输出语句，其常用的语句如下：</h4><table>
<thead>
<tr>
<th align="center">方法</th>
<th align="center">说明</th>
<th align="center">归属</th>
</tr>
</thead>
<tbody><tr>
<td align="center">alert(msg)</td>
<td align="center">浏览器弹出警示框</td>
<td align="center">浏览器</td>
</tr>
<tr>
<td align="center">console.log(msg)</td>
<td align="center">浏览器控制台打印输出信息</td>
<td align="center">浏览器</td>
</tr>
<tr>
<td align="center">prompt(info)</td>
<td align="center">浏览器弹出输入框，用户可以输入</td>
<td align="center">浏览器</td>
</tr>
</tbody></table>
<p><strong>注意：</strong><code>alert() </code>主要用来显示消息给用户，<code>console.log() </code>用来给程序员自己看运行时的消息。</p>
</li>
</ol>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">六根清静</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://liugenqingjing2.coding.me/2020/09/05/JavaScript%E7%9F%A5%E8%AF%86%E7%82%B9%E6%80%BB%E7%BB%93-%E4%BA%8C-JavaScript%E7%AE%80%E4%BB%8B/">https://liugenqingjing2.coding.me/2020/09/05/JavaScript知识点总结-二-JavaScript简介/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://liugenqingjing2.coding.me" target="_blank">小何blog (记录美好)</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" 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style="cursor:pointer;float:right" onclick="shuovisualchange()">编辑</a></div><div id="artitalk_main" style="width:100%;height:100%;padding:10px"></div></div></div><div class="sticky_layout"></div><div class="card-widget card-history"><div class="card-content"><div class="item-headline"><i class="fas fa-paw fa-spin"></i><span>那年今日</span></div><div id="history-news" style="height: 100px;overflow: hidden;"><div id="history-card"></div></div></div></div><div class="card-widget card-announcement"><div class="card-content"><div class="item-headline"><i class="fas fa-bullhorn card-announcement-animation"></i><span>公告</span></div><div class="announcement_content">大学生一枚，软件工程，想做全栈攻城狮，哈哈，有兴趣可以加 QQ:484695754 (也可以点上面的logo)，一起交流学习</div></div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="card-content"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#%E5%88%9D%E8%AF%86-JavaScript"><span class="toc-number">1.</span> <span class="toc-text">初识 JavaScript</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#1-1-JavaScript-%E6%98%AF%E4%BB%80%E4%B9%88%EF%BC%9A"><span class="toc-number">1.1.</span> <span class="toc-text">1.1 JavaScript 是什么：</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#1-2-JavaScript-%E7%9A%84%E4%BD%9C%E7%94%A8%EF%BC%9A"><span class="toc-number">1.2.</span> <span class="toc-text">1.2 JavaScript 的作用：</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#1-3-HTML-CSS-JS-%E7%9A%84%E5%85%B3%E7%B3%BB%EF%BC%9A"><span class="toc-number">1.3.</span> <span class="toc-text">1.3 HTML&#x2F;CSS&#x2F;JS 的关系：</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#HTML-CSS-%E6%A0%87%E8%AE%B0%E8%AF%AD%E8%A8%80%E2%80%93%E6%8F%8F%E8%BF%B0%E7%B1%BB%E8%AF%AD%E8%A8%80%EF%BC%9A"><span class="toc-number">1.3.0.1.</span> <span class="toc-text">HTML&#x2F;CSS 标记语言–描述类语言：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#JS-%E8%84%9A%E6%9C%AC%E8%AF%AD%E8%A8%80%E2%80%93%E7%BC%96%E7%A8%8B%E7%B1%BB%E8%AF%AD%E8%A8%80%EF%BC%9A"><span class="toc-number">1.3.0.2.</span> <span class="toc-text">JS 脚本语言–编程类语言：</span></a></li></ol></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#1-4-%E6%B5%8F%E8%A7%88%E5%99%A8%E6%89%A7%E8%A1%8C-JS-%E7%AE%80%E4%BB%8B%EF%BC%9A"><span class="toc-number">1.4.</span> <span class="toc-text">1.4 浏览器执行 JS 简介：</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#1-5-JS-%E7%9A%84%E7%BB%84%E6%88%90%EF%BC%9A"><span class="toc-number">1.5.</span> <span class="toc-text">1.5 JS 的组成：</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#ECMAScript%EF%BC%9A"><span class="toc-number">1.5.0.1.</span> <span class="toc-text">ECMAScript：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#DOM-%E2%80%94%E2%80%94%E6%96%87%E6%A1%A3%E5%AF%B9%E8%B1%A1%E6%A8%A1%E5%9E%8B%EF%BC%9A"><span class="toc-number">1.5.0.2.</span> <span class="toc-text">DOM ——文档对象模型：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#BOM-%E2%80%94%E2%80%94%E6%B5%8F%E8%A7%88%E5%99%A8%E5%AF%B9%E8%B1%A1%E6%A8%A1%E5%9E%8B%EF%BC%9A"><span class="toc-number">1.5.0.3.</span> <span class="toc-text">BOM ——浏览器对象模型：</span></a></li></ol></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#1-6-JS-%E5%88%9D%E4%BD%93%E9%AA%8C%EF%BC%9A"><span class="toc-number">1.6.</span> <span class="toc-text">1.6 JS 初体验：</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%A1%8C%E5%86%85%E5%BC%8F-JS%EF%BC%9A"><span class="toc-number">1.6.0.1.</span> <span class="toc-text">行内式 JS：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%86%85%E5%B5%8C-JS"><span class="toc-number">1.6.0.2.</span> <span class="toc-text">内嵌 JS:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%A4%96%E9%83%A8-JS%E6%96%87%E4%BB%B6"><span class="toc-number">1.6.0.3.</span> <span class="toc-text">外部 JS文件:</span></a></li></ol></li></ol></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#JavaScript%E6%B3%A8%E9%87%8A"><span class="toc-number">2.</span> <span class="toc-text">JavaScript注释:</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#2-1-%E5%8D%95%E8%A1%8C%E6%B3%A8%E9%87%8A"><span class="toc-number">2.1.</span> <span class="toc-text">2.1 单行注释:</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%8D%95%E8%A1%8C%E6%B3%A8%E9%87%8A%E7%9A%84%E6%B3%A8%E9%87%8A%E6%96%B9%E5%BC%8F%E5%A6%82%E4%B8%8B%EF%BC%9A"><span class="toc-number">2.1.0.1.</span> <span class="toc-text">单行注释的注释方式如下：</span></a></li></ol></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2-2-%E5%A4%9A%E8%A1%8C%E6%B3%A8%E9%87%8A"><span class="toc-number">2.2.</span> <span class="toc-text">2.2 多行注释:</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%A4%9A%E8%A1%8C%E6%B3%A8%E9%87%8A%E7%9A%84%E6%B3%A8%E9%87%8A%E6%96%B9%E5%BC%8F%E5%A6%82%E4%B8%8B%EF%BC%9A"><span class="toc-number">2.2.0.1.</span> <span class="toc-text">多行注释的注释方式如下：:</span></a></li></ol></li></ol></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#JavaScript-%E8%BE%93%E5%85%A5%E8%BE%93%E5%87%BA%E8%AF%AD%E5%8F%A5"><span class="toc-number">3.</span> <span class="toc-text">JavaScript 输入输出语句:</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E4%B8%BA%E4%BA%86%E6%96%B9%E4%BE%BF%E4%BF%A1%E6%81%AF%E7%9A%84%E8%BE%93%E5%85%A5%E8%BE%93%E5%87%BA%EF%BC%8CJS%E4%B8%AD%E6%8F%90%E4%BE%9B%E4%BA%86%E4%B8%80%E4%BA%9B%E8%BE%93%E5%85%A5%E8%BE%93%E5%87%BA%E8%AF%AD%E5%8F%A5%EF%BC%8C%E5%85%B6%E5%B8%B8%E7%94%A8%E7%9A%84%E8%AF%AD%E5%8F%A5%E5%A6%82%E4%B8%8B%EF%BC%9A"><span class="toc-number">3.0.0.1.</span> <span class="toc-text">为了方便信息的输入输出，JS中提供了一些输入输出语句，其常用的语句如下：</span></a></li></ol></li></ol></li></ol></li></ol></div></div></div><div class="card-widget card-recent-post"><div class="card-content"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/2021/03/21/Node-js%E5%AD%A6%E4%B9%A0-%E4%BA%8C%E5%8D%81%E4%B8%89-%E8%B7%A8%E5%9F%9F%E4%BB%8B%E7%BB%8D%E5%92%8CJSONP%E4%BB%8B%E7%BB%8D/" title="Node.js学习(二十三.跨域介绍和JSONP介绍)"><img data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20210321/qWPEashJOuNK.jpg" 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